Sheila,
If all you want to do is point and shoot, the sylus is an good camera with the UR-pro filter. I have 3 of them in a rental program. The problems include: No exposure control outside of program auto, macro is 8" minimum, no way to turn off the camera between dives w/o opening the housing (the camera powers down after 3 minutes but the battery is dead in 3 hours even in power down mode, flash is severely underpowered. The plus is: its small (fits in a big bcd pocket), it shoots good photos (just hold it steady as slow shutter speeds w/o flash can be a problem), it's simple.
My recommendation: if you want to play with exposure buy either the Olympus 750UZ (4 mp), 5050 or 5060 (5 mp). The 5050 uses 4-AA batteries but has the 35mm wide angle lens, the 5060 has a 28 mm wide agle lense but uses a proprietory battery. All 3 of these are larger (no bcd pocket) and require more reading to master all the controlls, but worth it in the long run.
Doug